Appendix: Photonic modulators
a typical Mach-Zehnder interferometer (MZI) modulator, the input
waveguide is split into two paths. With no voltage applied, the light is
coupled back together for the output waveguide, creating the “on”
signal. When the proper Vπ voltage is applied, it changes the refractive
index of the waveguide so that the light in the upper path is delayed
by a half a wavelength, or 180°. In this case, the two paths of light
are out of phase with each other, canceling each other and creating the
data center applications, which require small size and low power,
Kotura has developed an electro-absorption (EA) modulator. This tiny
modulator is a P-I-N structure constructed from germanium, doped with a
small amount of silicon in the silicon waveguide path. Applying current
changes the device from a photon absorber to a transparent waveguide.
About the author
Martin is the VP of Marketing, Contracts & Government Affairs for
Kotura. Martin has more than 25 years of experience in sales, marketing,
product and technical management in the semiconductor and
optoelectronics industries. Prior to joining Kotura, Martin held
numerous management and marketing positions with such companies as
Agility Communications, Lucent Technologies and AT&T. He began his
professional career at Bell Laboratories, where he spent five years
designing CAD tools. Martin received his MS degree in Computer
Engineering from the University of Michigan.
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